ZENworks 2020.2 Refesh Devices

Hello Everyone, I have a question. I have folders where I put ALL Mr workstations under devices. If I look at the Dynamic Windows Workstation group that has ALL Windows devices, I see that there are 841 devices in this group. If I refresh the group, Zenworks only refreshes 505 devices out of the 841.  If I go to all my workstation Device folders, check them all and refresh them, it refreshes 649 devices....

1. Why the difference

2. Does ZENworks try to determine what's online and what's not?

3, Because of the results I don't know if all devices are being refreshed when I force a refresh. Yes, there is the auto refresh, but with some of the software rollout I am doing right now, I need to know they are all being hit.